I had the same question; I don't know the answer yet, but I found a location for the answer http://www.openbsd.org/papers/bcrypt-paper.ps http://www.openbsd.org

I had the same question; I don't know the answer yet, but I found a location for the answer http://www.openbsd.org/papers/bcrypt-paper.ps http://www.openbsd.org/papers/bcrypt-paper.ps The documentation for py-bcrypt ( http://www.mindrot.org/projects/py-bcrypt/ http://www.mindrot.org/projects/py-bcrypt/) doesn't explain what happens, but shows use is very very easy. EDIT: current guess is that searching for the salt that was used might be part of what makes it hard.